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東海再処理施設における高放射性廃液貯蔵セル内の観察への取り組み

Approaches for observation inside the cell storing HAW tank at TRP

所 颯; 三好 竜太; 松木 拓也 ; 安田 猛; 蔦木 浩一 

Tokoro, Hayate; Miyoshi, Ryuta; Matsuki, Takuya; Yasuda, Takeshi; Tsutagi, Koichi

東海再処理施設では340m$$^{3}$$の高放射性廃液(HAW)をHAW貯槽に貯蔵している。しかしながら、極めて強い放射線環境であることから、HAW貯槽を設置しているセル内の有効な観察手段は確立されていない。今般、既設のガイドレールを活用し、セル内観察治具の設計・製作、モックアップによる装置の最適化、セル内観察、セル内の線量率分布測定を実施し、HAW貯槽の直接観察、セル内の線量率分布測定に初めて成功した。今後は、観察映像の品質の向上を課題として取り組んでいく。

High active liquid waste (HAW) of about 340 m$$^{3}$$ is stored in the HAW tanks at the Tokai Reprocessing Plant. However there is no effective observation method inside the cell installing the HAW tank since no one can enter because of its high dose rate. This time, by utilizing the existing guide rail, design and manufacture of the new device for observation, optimization of the device by mockup, inside the cell observation and dose rate distribution measurement inside the cell were conducted. As the result, we were succeeded in observation of the HAW tank and measurement of the dose rate distribution inside the cell for the first time. Here we report the results of those approaches.

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